From above, however, the outline of an ancient enclosure emerges with quiet clarity, its curve pressed into the landscape like a faint watermark. This is a rath, the Irish term for a ringfort, a type of enclosed farmstead built and used predominantly during the early medieval period, roughly between the fifth and twelfth centuries. Thousands of them survive across Ireland in various states of preservation, yet many exist now only as cropmarks or soil shadows, their earthen banks long since levelled by centuries of agriculture.

The site at Cullane Middle was identified not through fieldwork but through aerial photography, specifically imagery captured via Google Earth and Digital Globe on 28 June 2018. The record was compiled by Caimin O'Brien, drawing on details provided by Jean-Charles Caillère, and uploaded to the relevant heritage database in March 2020. The enclosure's circular outline, approximately 39 metres in diameter, falls within the range typical for a single-family ringfort, the kind that would once have housed a farming household along with their livestock and stores, all enclosed within a raised earthen bank, or possibly a low stone wall, designed as much for social demarcation as for defence.

Because the site is currently known only from aerial imagery, there is little to see on the ground without careful navigation. Those with an interest in early medieval landscapes might use the aerial photographs as a reference and approach the general area of Cullane Middle with an ordnance survey map, though access to private farmland would require landowner permission. The enclosure is most likely to show as a cropmark during dry summer conditions, when differential moisture retention in the soil causes the circular outline to appear as a tonal variation in grass or tillage. The June 2018 photographs that brought this site to attention were taken at exactly that kind of moment, the landscape briefly legible in a way it rarely is for long.